Read by c-shells on startup. e.g. to replace a login tch by bash, put this at the end of your .login
exec bash
Read by Bourne shells on startup. Put "global" variables in here
Read by emacs on startup. Common place to put emacs configuration commands
Mail forwarding file. Any mail sent to your account on this machine can be forwarded elsewhere. Can also be used to filter spam mail.
Top-level directory, root of directory tree
Most common commands
Additional common commands
Directory of all known devices. e.g. tty* (terminals), sound, fd* (floppy disk), etc
Administrative files
User directories
The password file, readable by all. Many Unix's hide the actual password now in /etc/shadow which is only readable by root
List of hosts, avoids using nameserver to look them up
List of standard TCP and UDP services
Null device, used to discard output
expr 1 != 2 > /dev/null